Methods of disciplining children depend on many factors - type of child, type of the offense that has been committed, time of day, time of previous offense and more. Sometimes, the fear of discipline is enough for a child. Such a child does not require more discipline per se. Others need a heavier hand. I try to work with positive as much as possible, but if pressed to bring discipline into the picture, I would first begin with assigning after-school work to the child and increase it as the seriousness of the act increases. If a few such assignments do not help and I think that things are getting out of hand, I would call the parents and inform them of the scenario in school, and work on a plan. If necessary, we would consult the principal.